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The Studies on Synthesis Technology and Thermodynamic Properties of 4-Nitropyridine N-Oxide

Author: ZhangPan
Tutor: ZengZuoXiang
School: East China University of Science and Technology
Course: Chemical Engineering
Keywords: 4 - nitro-N- oxide pyridine Pyridine N-oxide Solid Superacid SO42-ZrO2 Saturated vapor pressure Enthalpy of vaporization
CLC: TQ253.2
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract


The thermodynamic properties of 4 - nitro-N- oxide synthesis process and its key intermediates of pyridine N-oxide . Catalysis of phosphotungstic acid , pyridine N-oxide by hydrogen peroxide oxidation intermediates . The reaction conditions were investigated by orthogonal experiments , the results show that impact the factor size order of the reaction : the ratio of raw materials gt ; reaction Temperature gt ; the catalyst dosage gt ; reaction time , and further optimization of the investigated through single factor their process conditions . The zirconium oxychloride raw materials prepared by solid superacid SO the 4 / sub > the 2 - , / ZrO 2 , respectively, by infrared spectroscopy and X-ray diffraction Characterization of solid superacid obtained under different conditions , the results show that the polymorphs of the calcination temperature of the catalyst has a significant impact . Each of the above solid super acid as catalyst instead of sulfuric acid, the nitration reaction of pyridine N-oxide , the preliminary study of the relationship between the activity of the catalyst and the polymorph . The boiling point method measured the saturated vapor pressure of pyridine N-oxide 389.02 ~ 546.33 K, and the experimental data were correlated with the Antoine equation , the average absolute error of 1.30% . Combining the the Antoine equations and the Clausius-Clapeyron equation to obtain the enthalpy of evaporation of the pyridine N-oxide at boiling temperature . Using the the Othmer method, respectively reference materials to estimate the enthalpy of vaporization of pyridine N-oxide at 298.15 K and Watson equation estimated results were verified in good agreement with both the pyridine and benzene .

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of heterocyclic compounds > Six heterocycles containing a single different atoms > Triazine (pyridine ) family
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